Practices for Fabricating Asphalt Specimens for Performance Testing in Laboratories (2020) / Chapter Skim
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From page 49... ...
49 C H A P T E R 4 The states of Arizona, Illinois, Maine, Montana, and Texas were the five states selected for more detailed investigation. There were a number of reasons why these states were selected to be focus states.
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50 Practices for Fabricating Asphalt Specimens for Performance Testing in Laboratories Performance Test Arizona Illinois Maine Montana Texas Cantabro - - - - Mix design acceptance CTIndex - - Nonroutine research - Routine research E* - - - - Nonroutine research HWT Nonroutine research Mix acceptance and routine research Routine research, mix design acceptance, and QA mix acceptance on select projects Routine research, mix design acceptance, and QA mix acceptance Routine research, mix design acceptance, and QA mix acceptance IDT - - - - Mix design acceptance RLPD - - Routine research - SCB Nonroutine research Mix acceptance and Routine research - - SSG DTCF - - Routine research - SSG E*
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Case Examples 51 Specimen Fabrication Equipment and Procedures Arizona DOT reported that a Superpave gyratory compactor is used for all specimen fabrication although 90% of their mixtures are designed using the Marshall approach. Density requirements for the HWT and SCB test are as per the specification.
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52 Practices for Fabricating Asphalt Specimens for Performance Testing in Laboratories Mixture Types, Sampling, and Handling Procedures For the three performance tests conducted by Illinois DOT, LMLC, PMLC, and RPMLC as well as field-cored materials are used to fabricate test specimens. Illinois DOT reports that mixtures are sampled according to the agency's manual of test procedures (attached in Appendix E)
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Case Examples 53 dimensional requirements for I-FIT test specimens, Illinois DOT reported requiring a maximum notch width of 2.25 mm (0.09 in.) and an allowable notch depth of 15 ± 1 mm (0.6 ± 0.04 in.)
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54 Practices for Fabricating Asphalt Specimens for Performance Testing in Laboratories Maine DOT reported that the DOT wraps loose mix in plastic film for storage prior to laboratory compaction and that no other storage preparation is done between further specimen preparation steps. The plastic film is the most efficient method for the cardboard sampling boxes that are used.
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From page 55... ...
Case Examples 55 Mixture Types, Sampling, and Handling Procedures Montana DOT reported that laboratory-mixed and laboratory-compacted material, field cores, and reheated plant mix are used to fabricate specimens for the HWT. The plant material is typically sampled behind the paver or from the windrow (Figure 45)
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56 Practices for Fabricating Asphalt Specimens for Performance Testing in Laboratories Challenges Montana DOT reported that the most frequent issue they encounter in the specimen fabrication process is that air void requirements of the bulk specimen are not met. This is a relatively rare occurrence, but they observe that typically the air voids are on the high side as a result of the general practice of erring on the side of using less versus too much material.
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Case Examples 57 accordance with the TEX-222-F test procedure. Texas DOT reported that approximately 90% or more of plant-mixed material for performance testing is sampled from trucks.
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58 Practices for Fabricating Asphalt Specimens for Performance Testing in Laboratories performance properties. Furthermore, the agency also reported that they have implemented performance testing of tack coats using shear tests (TEX 249-F)
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